That's the story behind Exilium, a new sci-fi RPG that's up on Kickstarter now.
From the campaign:
Exilium is a science fiction role-playing game set in a distant future in a solar system known as the Flame system. The Flame system is filled genetically modified humans, robotic Puppets, and uplifted animals of bewildering forms.
The game centres on a group of seemingly ordinary people that have become possessed by the feeling of being trapped in a body not their own, and haunted by memories of a bizarre and beautiful place. This forms a disconnection to the material world, making these individuals increasingly feel like lost souls. Only the thing calling itself the Envoy offers any explanation. It tells them that they are of the Numina – a race of post humans who inhabit a realm called Elysium, a paradise, majestically isolated from the material universe. The player characters are Exiles - banished for a crime they committed in Elysium.
Players must appease the Envoy to earn the right to return to Elysium. They do this by hunting others of the kind who have become obsessed with the material world - Numina who are termed Shadows.
The campaign is about 1/3 of the way to their goal with still 22 days left to go.